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  • Consider a light beam incident from air to a glass slab at Brewster’s angle as shown in figure. A polaroid is placed in the path of the emergent ray at point P and rotated about an axis passi

Consider a light beam incident from air to a glass slab at Brewster’s angle as shown in figure. A polaroid is placed in the path of the emergent ray at point P and rotated about an axis passing through the centre and perpendicular to the plane of the polaroid.

Option: 1

For a particular orientation, there shall be darkness as observed through the polaroid


Option: 2

The intensity of light as seen through the polaroid shall be independent of the rotation


Option: 3

The intensity of light as seen through the polaroid shall go through a minimum but not zero for two orientations of the polaroid


Option: 4

The intensity of light as seen through the polaroid shall go through a minimum for four orientation of the polaroid


Answers (1)

best_answer

Consider the diagram the light beam incident from air to the glass slab at Brewster's angle \mathrm{\left(i_p\right)}. The incident ray is unpolarised and is represented by \mathrm{\operatorname{dot}(.) .}
The reflected light is plane polarised represented by arrows. As the emergent ray is unpolarised, hence intensity cannot be zero when passes through polarised.

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